I changed my Omega Elite 3.2 for a VXR8 in 2009, it's my everyday car and I enjoy it lots! Fuel consumption a bit iffy especially in around town traffic. I had an LPG conversion done a few years back. Saves me about £40 a week in fuel.
Steve
How do Steve. Fuel costs are not so important for me to own a car like that. But lpg would be high on the list once the car is purchased. I mean why not?
Any info much appreciated? Or pics even? 
Hi Chris
I had the install done professionally and it cost me £2k4 with VAT and it’s a BRC system with two evaporators and extra-large injectors. I have a 60L toroidal tank instead of a spare wheel. The 48L or so of gas I can fit in the tank is, in retrospect, a bit small. This gives me an LPG range of ~180 miles, so a fill up once a week. The gas fill inlet in low down on the rear offside valence.
I had the fit done in 2009 when I had an 80 mile commute and was putting lots of fuel in - at least once per journey I liked to WOT at least once :-) The estimated pay back at the fuel prices then (~50p/L for gas and 80p/L for petrol - was it ever that cheap!!) was 20,000 miles. As fuel cost rose the payback actually occurred earlier. Also psychologically the lower outlay of weekly dosh helped.
In terms of performance I find that I cannot tell. Last summer at PVS at Santa Pod, the car achieved a 13.6S@ 105mph 1/4 mile on petrol and with LPG 14.1S @99 mph. Someone could work out the power reduction I guess.
I still get through rear tyres at an alarming rate!
Does this info help?
Steve